<!DOCTYPE html>
        <html lang="en">

            <head>
            <meta charset="UTF-8">
            <meta name="viewport" content="width=device-width, initial-scale=1.0">
            <title>留言板</title>
        <style>
            .container {
            width: 350px;
            height: 300px;
            margin: 0 auto;
            /* border: 1px black solid; */
            text-align: center;
        }

            .grey {
            color: grey;
        }

            .container .row {
            width: 350px;
            height: 40px;

            display: flex;
            justify-content: space-between;
            align-items: center;
        }

            .container .row input {
            width: 260px;
            height: 30px;
        }

            #submit {
            width: 350px;
            height: 40px;
            background-color: orange;
            color: white;
            border: none;
            margin: 10px;
            border-radius: 5px;
            font-size: 20px;
        }
        </style>
        </head>

        <body>
        <div class="container">
            <h1>留言板</h1>
            <p class="grey">输入后点击提交, 会将信息显示下方空白处</p>
            <div class="row">
                <span>谁:</span> <input type="text" name="" id="from">
            </div>
            <div class="row">
                <span>对谁:</span> <input type="text" name="" id="to">
            </div>
            <div class="row">
                <span>说什么:</span> <input type="text" name="" id="say">
            </div>
            <input type="button" value="提交" id="submit" onclick="submit()">
            <!-- <div>A 对 B 说: hello</div> -->
        </div>

        <script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.6.4/jquery.min.js"></script>
    <script>

        $.ajax({
            type: "get",
            url: "/message/getList",
            success: function() {
                for(var message of messages){
                    var html = "<div>"+ message.from + "对"+ message.to +"说:" + message.message+ "</div>"
                    $(".container").append(html);
                }
            }
        });







        function submit(){
            //1. 获取留言的内容
            var from = $('#from').val();
            var to = $('#to').val();
            var say = $('#say').val();
            if (from== '' || to == '' || say == '') {
                return;
            }

            $.ajax({
                type: "post",
                url: "/message/publish",
                data: {
                    from: from,
                    to: to,
                    message: say
                },
                success: function(result) {
                    if(result == true) {
                        //2. 构造节点
                        var divE = "<div>"+from +"对" + to + "说:" + say+"</div>";
                        //3. 把节点添加到页面上    
                        $(".container").append(divE);
                        //4. 清空输入框的值
                        $('#from').val("");
                        $('#to').val("");
                        $('#say').val("");
                    }else{
                        alert("发表失败");
                    }
                }
            });

            
        }
        
    </script>
</body>

</html>